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Questions and Answers
What is the primary source of energy for the Earth?
What is the primary source of energy for the Earth?
- The Moon
- The Sun (correct)
- Volcanoes
- Earth's Core
Which of the following is the smallest unit of life?
Which of the following is the smallest unit of life?
- Atom
- Molecule
- Cell (correct)
- Organ
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Study Notes
The Sun
- The Sun is the primary source of energy for the Earth.
- The Sun is a star.
- It produces energy through nuclear fusion, a process that combines hydrogen atoms into helium atoms.
- This process releases a tremendous amount of energy in the form of light and heat.
- This energy travels to Earth as sunlight.
- Sunlight is essential for life on Earth.
- It fuels photosynthesis, the process by which plants convert sunlight into chemical energy.
- It also warms the planet and drives weather patterns.
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